JPS6419562A - Clock generation circuit for detecting data of optical disk - Google Patents
Clock generation circuit for detecting data of optical diskInfo
- Publication number
- JPS6419562A JPS6419562A JP17534387A JP17534387A JPS6419562A JP S6419562 A JPS6419562 A JP S6419562A JP 17534387 A JP17534387 A JP 17534387A JP 17534387 A JP17534387 A JP 17534387A JP S6419562 A JPS6419562 A JP S6419562A
- Authority
- JP
- Japan
- Prior art keywords
- zone
- pll
- osc0
- lock
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To lock a PLL in a short time even when coarse positioning is performed at a zone adjacent to an object track and to realize fast seek, by using and switching three frequencies suitable for an object zone and a preceding and succeeding zones as the interpolation signal of the PLL. CONSTITUTION:To a PLL circuit 7, the fundamental frequency OSC0 of the object zone and a preceding and a succeeding frequencies OSC-1 and OSC+1 are outputted from a signal generator 12 as the interpolation signals when no reproducing signal from a disk exists, and the OSC0 of the object zone is selected by a selector 5 ordinarily. When the seek to the object track is performed, no sufficient lock is applied when a head 11 catches a little an adjacent zone since the interpolation signal of the PLL7 is the OSC0, and no reproduction of an ID part is performed. Since a microprocessor switches the interpolation signal of the PLL to the frequency of the adjacent zone in order by controlling the selector 5, the lock of the PLL7 can be performed sufficiently, then, the reading of the ID can be performed stably.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17534387A JPS6419562A (en) | 1987-07-14 | 1987-07-14 | Clock generation circuit for detecting data of optical disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17534387A JPS6419562A (en) | 1987-07-14 | 1987-07-14 | Clock generation circuit for detecting data of optical disk |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6419562A true JPS6419562A (en) | 1989-01-23 |
Family
ID=15994403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17534387A Pending JPS6419562A (en) | 1987-07-14 | 1987-07-14 | Clock generation circuit for detecting data of optical disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6419562A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009154794A (en) * | 2007-12-27 | 2009-07-16 | Hiruta Kogyo Co Ltd | Parking brake apparatus |
-
1987
- 1987-07-14 JP JP17534387A patent/JPS6419562A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009154794A (en) * | 2007-12-27 | 2009-07-16 | Hiruta Kogyo Co Ltd | Parking brake apparatus |
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